/*
 * Flashlib - QB9 common Flash library
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.qb9.flashlib.lang
{
	/**
	 * Return a new Array or Object containing only the elements that pass a given test.
	 *
	 * @see foreach() to see the difference between this function and anArray.filter
	 *
	 * @see http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/Array.html#filter()
	 */
	public function filter(obj:Object, fn:Function, ...args:Array) : *
	{
		var isArr:Boolean = obj is Array;
		var pass:Object = isArr ? [] : {};

		for (var i:Object in obj)
		{
			var value:Object = obj[i]; 
			if (fn.apply(null, [value].concat(args)))
				pass[isArr?pass.length:i] = value;
		} 
		
		return pass;
	}
}